止口螺栓连接结构解析建模与阻尼特性分析

针对止口螺栓连接,论文从连接结构轴向拉压力学行为分析出发,提出了可模拟连接非线性刚度和阻尼耗散的扇区模型,基于此进一步构建了弯矩载荷下的非线性解析模型.通过与三维实体有限元模型计算结果的对比分析,验证了所提出模型的有效性,并揭示了连接的非线性刚度特性和迟滞阻尼特性.基于所提出模型研究了关键参数对止口螺栓的阻尼特性的影响...

Analysis on analytical modelling and damping characteristics of bolted joint structure with spigot

For the bolted joint with spigot,a nonlinear model for the single region of bolted joint under axial loads was built.Based on this model,the nonlinear analytical model was further proposed to describe the behavior of joint under bending moment.By performing a comparison study with the finite contact element model,the accuracy of the analytical model was validated,meanwhile,the nonlinear stiffness and damping characteristics of the joint were highlighted.Finally,the influence law of key parameters on joints' damping characteristics was investigated.The results showed that the ability of damping dissipation of bolted joint firstly increased and then decreased with the increase of bending moment amplitude and friction coefficient,while the ability of damping dissipation increased for the increasing interference fit of spigot and flange length.More importantly,flange length can not only affect the damping characteristics,but also decrease the equivalent stiffness of bolted joint significantly.